.sidebar{
  position: fixed;
  width: 300px;
  text-align: right;
}
.sidebar li {
  padding: 12px 0;
  color: #ddd;
}
.sidebar li a {
  text-decoration: none;
  color: #a0a0a0;
  font-size: 16px;
  line-height: 1em;
}
.sidebar li a:hover, .sidebar li a:focus{
  text-decoration: none;
}
.sidebar li a.highlight {
  color: #3f3939;
}
.content-box {
  float: right;
  width: 800px;
}
.content-box section {
  box-sizing: border-box;
  width: 100%;
  height: 400px;
  border: 1px solid;
  padding: 20px;
}